Worried it's early labour at 33 weeks

I keep having pain in pelvic area and back it comes and goes. I haven't lost my plug or had a bloody show or anything but this pain is like intense pushing in the pelvic area. I keep pressing the sides of my stomach and they still squish a little before feeling hard. I'm not sure what is happening or if I should call the midwives at L&D.

And I'm home on my own 😰